Chapter 6: Cell Membranes Flashcards Preview

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Flashcards in Chapter 6: Cell Membranes Deck (20):
1

a layer two molecules thick

bilayer

2

a thin layer of lipids and proteins, separates a cell from its surrounding

plasma membrane

3

form channels that allow selected polar molecules and ions to pass across a membrane

transport proteins

4

the plasma membrane identify a cell as part of the same individual or as foreign

recognition proteins

5

recognize and bind molecules from other cells that act as chemical signals, such as hormones

receptor proteins

6

bind cells together by recognizing and binding receptors or chemical groups on other cells

cell adhesion proteins

7

speed chemical reactions in membranes

enzymes

8

lipid molecules with carbohydrate groups attached

glycolipids

9

protein molecules with carbohydrate groups attached

glycoproteins

10

the carbohydrate groups of the cell surface glycolipids and glycoproteins form a surface coat

glycocalyx

11

proposes that the membrane consists of a fluid phospholipid bilayer in which proteins are embedded and float freely

fluid mosaic model

12

embedded in the phospholipid bilayer

integral proteins

13

held to membrane surfaces by noncovalent bonds

peripheral proteins

14

biological membranes are....?

selectively permeable

15

-diffusion through the lipid part of a biological membrane
-depends solely on molecular size and lipid solubility

simple diffusion

16

-diffusion of polar and charged molecules through transport proteins in the hydrophobic lipid bilayer

facilitated diffusion

17

integral membrane proteins that form hydrophilic channels in the membrane through which water and ions can pass

channel proteins

18

channel protein that transport water

aquaporins

19

-switch between open, closed, or intermediate states
-facilitate transport of ions (Na+, K+, Ca2+, Cl-)

gated channels

20

-bind pecific single olute and transport it across the lipid bilayer
-undergo conformational changes that move the solute -binding site from one side of the membrane to the other
-can become saturated when there are too few transport proteins to handle all the solute molecules

carrier proteins